EP2606520A1 - Cellule électrochimique pourvue d'au moins un dispositif de décompression - Google Patents

Cellule électrochimique pourvue d'au moins un dispositif de décompression

Info

Publication number
EP2606520A1
EP2606520A1 EP11748578.9A EP11748578A EP2606520A1 EP 2606520 A1 EP2606520 A1 EP 2606520A1 EP 11748578 A EP11748578 A EP 11748578A EP 2606520 A1 EP2606520 A1 EP 2606520A1
Authority
EP
European Patent Office
Prior art keywords
electrochemical cell
sheath
frame element
cell according
energy unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11748578.9A
Other languages
German (de)
English (en)
Other versions
EP2606520B1 (fr
Inventor
Tim Schaefer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Li Tec Battery GmbH
Original Assignee
Li Tec Battery GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Li Tec Battery GmbH filed Critical Li Tec Battery GmbH
Publication of EP2606520A1 publication Critical patent/EP2606520A1/fr
Application granted granted Critical
Publication of EP2606520B1 publication Critical patent/EP2606520B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • Electrochemical cell with at least one
  • the present invention relates to an electrochemical cell for a battery assembly, in particular to an electrochemical cell having at least one pressure relief device.
  • batteries primary storage
  • accumulators secondary storage
  • Primary storage is typically charged only once and disposed of after discharge, while secondary storage allows multiple (from a few 100 to over 10,000) cycles of charge and discharge.
  • rechargeable batteries are also referred to as batteries.
  • Electrochemical cells are known from the prior art which have an energy unit which has an electrode stack, at least one current conductor connected to the electrode stack and an enclosure at least partially enclosing the electrode stack.
  • the envelope is intended on the one hand to prevent the escape of chemicals from the electrode stack into the environment and, on the other hand, to protect the constituents of the cell from undesired interaction with the environment, for example against water or water vapor.
  • electrochemical cells are known from the prior art, in which such an energy unit is at least partially accommodated in at least one frame element.
  • Such frame elements are used in particular for the mechanical stabilization of the energy units, in particular during the manufacturing process of a battery arrangement with a plurality of electrochemical cells.
  • the electrochemical cells or storage devices may, for example, in the case of overload or short circuit, in case of damage or in normal operation at high heat from the outside in a thermally overheated state from the outside, which generates an increased internal cell pressure, which causes bursting, Ignite or explode the cell and the housing may result.
  • a pressure relief device is provided for reducing such an overpressure in the interior of the energy unit.
  • Such pressure relief devices are designed, for example, as a local weakening of the sealing seam, for example by means of inserted elements with a lower melting point.
  • the invention has for its object to provide an improved electrochemical cell, which allows a safe reduction of overpressure inside the energy unit, if necessary. This is achieved according to the invention by the teaching of the independent claims. Preferred developments of the invention are the subject of the dependent claims.
  • an electrochemical cell which has an energy unit, at least one frame element at least partially accommodating the energy unit, and at least one pressure relief device for reducing an overpressure in the energy unit.
  • the energy unit has an electrode stack, at least one current conductor connected to the electrode stack, and an enclosure at least partially enclosing the electrode stack.
  • the enclosure of the energy unit in turn has at the circumferential narrow sides of the electrochemical cell a plurality of edge portions, wherein the at least one current conductor in a first Edge portion at least partially extends out of the envelope and this first edge portion of the envelope has a substantially fluid-tight first seal.
  • the at least one frame element in the region of the first edge portion of the enclosure has at least one first support web, which is at a maximum distance of about 1 mm from the first sealed seam of the enclosure.
  • an electrochemical energy storage device or battery arrangement with at least one such electrochemical cell is also provided.
  • the at least one current conductor extends at least partially out of the enclosure in a first edge section and the at least one frame element in the region of the first edge section of the enclosure has at least one first support web which is at most approximately 1 mm from the first sealed seam of the enclosure is spaced in the first edge portion. Because of this first support web in the region of the first edge portion of the envelope prevents the frame member tearing or rupture of the seal in the event of overpressure inside the energy unit in the field of current collector (which often represents a weak spot of the sealed seam in conventional cells) and the pressure discharge can exclusively via the specially provided pressure relief device take place (which process is also referred to as "venting").
  • the electrochemical cell according to the invention the advantage is achieved in this context that, at an elevated pressure and / or an elevated temperature in the interior of the energy unit, the pressure reduction and the material discharge take place through the at least one pressure relief device and not in the region of the current conductors and the battery management system. In this way, the reliability of the battery and the safety of the passengers can be increased when a critical pressure or temperature condition occurs inside the energy unit of an electrochemical cell. In particular, it is also possible to prevent short circuits in the region of the current conductors caused by electrically conductive venting gases or electrolytes.
  • an "electrochemical energy storage device” is understood as meaning any type of energy store which can be removed from electrical energy, wherein an electrochemical reaction takes place in the interior of the energy store
  • the plurality of electrochemical cells may be connected in parallel to store a larger amount of charge, or may be connected in series to provide a desired operating voltage, or may be a combination of parallel and series connection.
  • electrochemical cell or “electrochemical energy storage cell” is understood here to mean a device which controls the delivery electrical energy is used, the energy is stored in a chemical form. In the case of rechargeable secondary batteries, the cell is also designed to receive electrical energy, convert it to chemical energy, and store it.
  • the shape (ie, in particular, the size and the geometry) of an electrochemical cell can be chosen depending on the available space.
  • the electrochemical cell is formed substantially prismatic or cylindrical.
  • the present invention is particularly useful for electrochemical cells, referred to as pouch cells or coffebag cells, without the electrochemical cell of the present invention being limited to this application.
  • an “electrode stack” is to be understood as meaning an arrangement of at least two electrodes and an electrolyte arranged therebetween.
  • the electrolyte may be partially accommodated by a separator, the separator then separating the electrodes.
  • the electrode stack has a plurality of layers of electrodes and electrodes
  • the electrodes are, for example, plate-shaped or foil-like and are preferably arranged substantially parallel to one another (prismatic energy storage cells)
  • the electrode stack may also be wound and one in the Have substantially cylindrical shape (cylindrical energy storage cells).
  • the term “electrode stack” should also include such electrode coils.
  • the electrode stack may also comprise lithium or another alkali metal in ionic form.
  • a "current conductor” is to be understood as meaning an electrically conductive design element of an electrochemical cell which is used to transport electrical energy into or out of the cell
  • Electrochemical cells usually have two types of current conductors, each with one of both Electrodes or electrode groups - anodes or cathodes - are electrically conductively connected inside the cell.
  • each electrode of the electrode stack of the cell has its own current conductor or the electrodes of the same polarity of the electrode stack are connected to a common current conductor.
  • the shape of the current conductor is adapted to the shape of the electrochemical cell or its electrode stack.
  • the term "enclosure” is intended to include any type of device which is suitable for preventing the escape of chemicals from the electrode stack into the environment and for protecting the constituents of the electrode stack from damaging external influences.
  • the enclosure may consist of one or more molded parts and / or
  • the covering can be made of a substantially rigid material or of an elastic material
  • the covering is preferably formed of a gas-tight and electrically insulating material or layer composite preferably encloses the electrode stack as possible without gaps and air cushion to allow good heat conduction between the enclosure and the interior of the electrochemical cell.
  • the term "energy unit” is understood to mean a self-contained structural unit which fulfills the properties of energy storage and energy delivery.
  • the energy unit contains in particular, but not necessarily exclusively, the electrode stack, the current conductor and the enclosure.
  • a "pressure relief device” is to be understood as meaning all types of devices which are suitable for opening the sheath under predetermined conditions, in particular in the event of pressure and / or temperature increase inside the electrochemical cell (eg due to overloading) or the like) a pressure discharge with or without material discharge out of the cell enable. It is to be expressly understood that the present invention is not limited to any specific types of pressure relief devices. In the case of two or more pressure relief devices on an electrochemical cell, they may be of the same type or different from each other.
  • a “frame element” in the sense of the present invention is any constructional device which is suitable for mechanically stabilizing an energy unit of an electrochemical cell. This stabilization is particularly, but not exclusively, advantageous during the production process of a battery arrangement with a plurality of electrochemical cells.
  • Frame element "should in particular both devices which substantially completely enclose an energy unit on the narrow sides thereof (corresponding to a frame in the conventional sense), as well as devices which support a power unit only on a narrow side, a part of the narrow sides or a part of one or more narrow sides (corresponding to a frame leg or frame leg assembly).
  • the at least one frame elements may preferably be formed in one or more parts.
  • frame elements are conceivable which support an energy unit (on one side) only from one main side or support an energy unit (on both sides) from its two main sides.
  • a first edge portion of the envelope is defined in the region of the at least one current conductor, ie one envelope usually has two first edge portions for the two
  • a "sealed seam” is a fluid-tight (ie liquid-tight and gas-tight) connection of one cladding part with another component (in particular eg a further cladding part) or a current collector) understood.
  • the envelope has on its connection side a material or a material layer, which (s) can be at least partially melted and joined under pressure (so-called heat sealing).
  • support web in the context of the present invention is intended to mean any structural element which is attached to the frame element and protrudes toward a peripheral portion of the enclosure
  • the support web can advantageously be coated, treated or provided with an additional element on its side facing the respective edge section of the cover
  • the supporting action of the support web of the at least one frame element preferably prevents the sealing seam from being torn by a peeling stress which occurs in the event of overpressure arises inside the energy unit.
  • the at least one first support web of the at least one frame member is spaced at most about 0.75 mm, more preferably at most about 0.5 mm, even more preferably at most about 0.3 mm from the first sealed seam of the cover.
  • the at least one first support web of the at least one frame member has a width in the transverse direction to the first edge portion of at least about 1, 5 mm, more preferably at least about 2.5 mm, more preferably at least about 3 mm. In this way, a reaching large bearing or boundary surface for the first seal at the first edge portion of the envelope provided.
  • the at least one pressure relief device has a weakening of at least one further substantially fluid-tight sealed seam of the envelope or at least one further envelope section, wherein this further sealed seam or this further enveloping section in a further edge section, which is different from the at least one first edge section Enclosure is provided.
  • a weakening of a further sealing seam or of a further covering part has the effect that, when an overpressure arises in the interior of the energy unit, the covering preferably rises / ruptures / breaks open at this point.
  • a "weakening" of a sealing seam of the envelope or of a wrapping section can advantageously be achieved by a local weakening of the material or material structure, by a special shaping of the envelope at this point, by the introduction of additional elements with special physical and / or chemical properties (eg lower melting point , etc.) in the material or the material structure or by a lower strength of the sealed seam can be achieved at this point.
  • the at least one pressure relief device additionally or alternatively has a recess in the at least one frame element, this recess being provided in the region of a further edge section of the enclosure which is different from the at least one first edge section and the frame element in the region of this recess is spaced from a further sealing seam of the envelope or a further wrapping section.
  • a recess in the frame member allows for the emergence of an overpressure in the interior of the energy unit, a deflection of the enclosure or the Enveloping material, so that the envelope or a sealed seam at this point easier open / break / tear.
  • the at least one pressure relief device preferably has a weakening of the further sealing seam or covering section and a recess in the frame element.
  • the recess in the at least one frame element is then arranged substantially in the region of the weakening of the further sealing seam of the sheath or the further sheath portion.
  • the weakening of the further sealing seam of the envelope or of the further covering section in the longitudinal direction of the further edge section of the envelope is at least as great as the recess in the at least one frame element.
  • At least one opening device for opening the further sealed seam of the envelope or of the further envelope section for pressure reduction is also provided in the recess of the frame element.
  • the term "opening device” encompasses all constructional elements that support an opening / rising / rupturing / breaking of the further sealing seam or of the further covering section in the region of the recess of the frame element.
  • the opening device preferably has one or more teeth, Thorns, blades, cutting elements or the like.
  • the at least one pressure relief device allow controlled venting at a predetermined location of the enclosure outside the range of the current conductors.
  • the at least one frame element in the region outside the first edge portion of the enclosure at least one further support web, which at least partially rests against another sealing seam of the envelope or another wrapping section.
  • the sheath or its sealing seams are held not only in the region of the first edge portion in the Stromableitern, but also at other locations to prevent there unwanted rising / breaking / tearing when an overpressure inside the energy unit and to achieve a controlled venting exclusively on the at least one pressure relief device.
  • the at least one pressure relief device is arranged on a narrow side of the electrochemical cell, which lies opposite the first edge portion of the enclosure. In this way, the pressure is discharged at the emergence of an overpressure inside the energy unit (as far as possible) away from the current conductors.
  • the entire sealing seam can at the other edge portion of the wrapper, the at the first edge portion and the current conductor »opposite short side, be provided with a weakening as explained above.
  • the sealing seams at further edge portions of the covering which lie on the narrow sides of the energy unit running transversely to the first edge portion, may be wholly or partly provided with such a weakening.
  • the at least one pressure relief device is arranged on a narrow side of the electrochemical cell, which is arranged substantially below in the installed state of the electrochemical cell.
  • the pressure is discharged at the occurrence of an overpressure inside the energy unit down and not, for example, in the direction of a passenger compartment of a motor vehicle, under which the battery assembly with the / the electrochemical cell (s) is arranged.
  • a stack of alternately arranged energy units and frame elements is preferably provided such that each energy unit is held between two frame elements and each frame element is associated with two adjacent energy units. In this way, the number of total frame elements required for the plurality of electrochemical cells can be reduced.
  • the two-sided use of the frame elements is of course only in the interior of the stack and is no longer given at the edge of the stack, at least for the outermost frame members. For the two-sided use of the frame members, these are preferably formed substantially symmetrically in the stacking direction.
  • the two-sided use of the frame elements may in this context apply to all or only part of the electrochemical cells in the interior of the stack.
  • FIG. 1 is a schematic exploded perspective view of an electrochemical cell according to an embodiment of the present invention.
  • FIG. 1 is a schematic exploded perspective view of an electrochemical cell according to an embodiment of the present invention.
  • FIG. 1 is a schematic perspective view of a first preferred embodiment of an energy unit for an electrochemical cell according to the present invention.
  • FIG. 3 is a schematic perspective view of a second preferred embodiment of an energy unit for an electrochemical cell according to the present invention
  • 4 is a schematic perspective view of a preferred embodiment of a frame member for an electrochemical cell according to the present invention
  • Fig. 5 is a schematic partial sectional view of an electrochemical cell according to the present invention for explaining the operation of the invention.
  • Fig. 6 shows schematic partial perspective views of an electrochemical cell according to the present invention for explaining the operation of the invention.
  • FIG. 1 shows an exploded view of an electrochemical cell having an energy unit 10 and two frame elements 16, wherein these two frame elements 16 can each be assigned to two adjacent energy units 10 in a stack of several electrochemical cells in a battery arrangement.
  • the power unit 10 is a unitary unit and includes an electrode stack (not shown), a first current collector 12 connected to the anodes of the electrode stack, a second current collector 14 connected to the cathodes of the electrode stack, and a surrounding electrode stack Envelope 18, for example in the form of a multilayer film.
  • the two current conductors 12, 14 protrude partially out of the envelope 18 of the energy unit 10 so that they can be contacted from the outside.
  • This energy unit 10 is held in its entirety in this embodiment on its four narrow sides between the two frame members 16.
  • multi-part frame elements or frame elements which hold the energy unit only over part of its circumference conceivable.
  • Figures 2 and 3 show two possible embodiments of a power unit for such an electrochemical cell.
  • the sheath 18 is constructed in each case from two substantially congruent sheath parts, which connect the electrode stack to one another in a fluid-tight manner (in other words liquid-tight and gas-tight), in particular are sealed, so that a circumferential sealed seam is formed.
  • the envelope 18 may also be constructed of a wrapping part, which is folded and sealed, so that at least one narrow side of the energy unit 10 eliminates a sealed seam.
  • the envelope 18 has a plurality of edge portions, which extend in total around the energy unit 10 in its entirety.
  • the circumferential sealing seam (mentally) can be divided into several sealing seams.
  • a first sealed seam 20 or 22 is present in each case.
  • a plurality of second sealing seams 24 are defined at the edge portions of the sheath 18, which lie outside the first edge portions on the same narrow side of the power unit 10 as this.
  • a third sealed seam 26 is formed on the edge portion of the covering 18 on the narrow side of the energy unit 10 (on the right in FIGS. 2 and 3) opposite the first edge sections.
  • a fourth and a fifth sealing seam 28 and 30 can be found at the edge portions of the envelope 18 on the narrow sides of the energy unit 10 running transversely to the narrow side with the current conductors 12, 14 (top or bottom in FIGS. 2 and 3).
  • the third sealed seam 26 of the covering 18 has a weakening 32 which extends over a section of the corresponding narrow side of the energy unit 10.
  • the third sealed seam 26 of the covering 18 has a weakening 32 which extends essentially over the entire narrow side of the energy unit 10.
  • a plurality of weakenings 32 may be provided in the third seal seam 26, and / or the fourth and / or fifth seal seams 28, 30 may also have one or more weakenings. If there is no sealed seam 26 on the narrow side of the energy unit 10 opposite the first edge sections of the casing 18, but, for example, a wrapped casing part, the weakenings 32 provided are correspondingly provided in such a casing section.
  • Figure 3 shows a frame member 16 of the electrochemical cell of Figure 1 in more detail.
  • the frame member 16 of this embodiment is composed of four frame legs in one or more parts, so that it completely surrounds the four narrow sides of the power unit 10 and the respective edge portions of the sheath 18 can support there.
  • the frame member 16 is configured with a plurality of support legs 34 to 44 extending from the side of the frame member 16 toward the edge portions of the sheath 18 of the adjacent power unit 10. On the side facing away from in Figure 3, the frame member 16, these support webs 34 to 44 also on.
  • the frame element 16 is thus formed substantially symmetrically in the stacking direction of a plurality of electrochemical cells in a battery arrangement.
  • the support webs 34 to 44 are formed, for example, on the frame member 16 or formed as separate components and fixedly connected to the frame member 16.
  • the support bars 34 to 44 of the frame member 16 are mounted on the frame member 16 corresponding to the edge portions of the sheath 18.
  • a first support web 34 is arranged in the region of the first sealing seam 20 in the first edge section, in which the first current conductor 12 extends out of the cover 18, and is the first support web 36 in the region of the first sealed seam 22 in the first edge section, in which the second current collector 14 extends out of the enclosure 18 out.
  • second support webs 38 in the region of the second sealing seams 24, a third support web 40 in the region of the third sealed seam 26, a fourth support web 42 in the region of the fourth sealed seam 28 and a fifth support web 44 in the region of the fifth sealed seam 30 of the enclosure 18 are arranged.
  • the first to fifth support webs 34 to 44 are provided almost completely along the four narrow sides of the power unit 10 on the frame member 16.
  • the support webs 34 to 44 in this embodiment have different widths (transverse to their respective longitudinal direction), but may also be dimensioned substantially equal to each other.
  • the width of the support webs 34 to 44 in the transverse direction to the respective edge portion is at least about 1, 5 mm, more preferably at least about 2.5 mm, more preferably at least about 3 mm in order to achieve sufficient support of the sealing seams 20 to 30.
  • the first support webs 34 and 36 are made weaker so as to be spaced from the first seal seams 20 and 22 at the current conductors 12 and 14, respectively.
  • FIG. 5 this is illustrated for the first support webs 34, 36 on the first sealing seams 20, 22. It can be seen in Figure 4 in particular that the with connected to the electrode stack current conductor 12, 14 is led out of the enclosure 18.
  • the first edge portions of the sheath 18 are respectively fluid-tightly connected to the current conductor 12, 14 by means of a sealed seam 20, 22. If an overpressure arises in the interior of the cell or energy unit 10, this overpressure generates peeling forces or peel stresses in the region of the weak point of the sheath 18 shown in FIG. 5 (see arrows 48), which divide the edge sections of the sheath 18 apart and away from the edges Current arresters 12, 14 try to tear.
  • first support webs 34, 36 on the frame element 16 which are missing in comparable frame elements of conventional electrochemical cells, counteract this rising / tearing of the first sealing seams 20, 22.
  • the first support webs 34, 36 of the frame member 16 limit the ability of the first edge portions of the shell 18 to deflect, thus supporting the first sealing seams 20, 22. The effect can be effectively prevented Enclosure 18 or the sealing seam 20, 22 at an overpressure in the interior of the energy unit 10 in the region of the current conductors 12, 14 ruptures and the venting gases escape there.
  • the frame element 16 furthermore has a recess 46 on its frame limb, which is formed with the third support web 40.
  • the recess 46 substantially corresponds to a lack of the third support web 40 in a subsection.
  • This recess 46 is further positioned according to the weakening 32 of the third sealing seam 26 of the sheath 18 in FIG. 2 or at any, preferably central location corresponding to the weakening 32 of the third sealed seam 26 of the sheath 18 in FIG.
  • the recess 46 of the frame member 16 and the weakening 32 of the third sealing seam 26 together form a pressure relief device of the electrochemical cell. As illustrated in FIG.
  • the frame element 16 in the region of its recess 46 in the normal state of the cell (ie in particular without overpressure inside the cell), the frame element 16 is spaced apart from the third sealed seam 26 with its weakening 32.
  • the third support webs 40 of two adjacent frame members 16 on the sealed seam 26 of the enclosure 18 of the energy unit 10 received between them and hold them together. If an overpressure arises in the interior of the energy unit 10, this overpressure in the electrochemical cell according to the invention is discharged exclusively by the pressure relief device 32, 46 away from the current conductors 12, 14 of the energy unit 10 and, if possible, in the lower region of the electrochemical cell.
  • the overpressure in the interior of the energy unit 10 causes peeling stresses on the sealing seams 20 to 30 of the sheath 18, which tear open the third sealed seam 26 in the region of the recess 46 of the frame element 16.
  • the frame elements 16 are preferably also configured with fastening devices 52 (see Figure 4), with which two adjacent frame members 16 or all frame elements 16 of a cell stack aligned with each other and / or can be firmly connected to each other (eg by means of screws, rivets, clamping pin or the like). These Connection is beyond also for the supporting effect of the support webs 34-44 against the sealing seams 20-30 of the sheath 18 of advantage.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Hybrid Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

L'invention concerne une cellule électrochimique qui présente une unité énergétique (10) comprenant une pile d'électrodes, au moins un dérivateur de courant (12, 14) et une enveloppe (18) enfermant au moins en partie la pile d'électrodes; au moins un élément de cadre (16) qui reçoit au moins en partie l'unité énergétique (10); et au moins un dispositif de décompression (32, 46). L'enveloppe (18) présente plusieurs sections de bord sur les petits côtés périphériques de la cellule électrochimique, ledit dérivateur de courant (12, 14) s'étend au moins en partie en dehors de l'enveloppe (18) sur une première section de bord et cette première section de bord de l'enveloppe (18) présente un cordon de scellement (20, 22) pratiquement étanche aux fluides. Ledit élément de cadre (16) présente en outre dans la région de la première section de bord de l'enveloppe (18) au moins un premier point d'appui (34, 36) qui est espacé au maximum d'environ 1 mm du premier cordon de scellement (20, 22) de l'enveloppe (18) et empêche ou au moins rend difficile un déchirement de ce premier cordon de scellement (20, 22) dans la région dudit dérivateur de courant (12, 14) lors d'une augmentation de la pression et/ou de la température à l'intérieur de la cellule.
EP11748578.9A 2010-08-17 2011-08-11 Cellule électrochimique avec au moins un dispositif de décompression Not-in-force EP2606520B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010034545A DE102010034545A1 (de) 2010-08-17 2010-08-17 Elektrochemische Zelle mit wenigstens einer Druckentlastungsvorrichtung
PCT/EP2011/004047 WO2012022448A1 (fr) 2010-08-17 2011-08-11 Cellule électrochimique pourvue d'au moins un dispositif de décompression

Publications (2)

Publication Number Publication Date
EP2606520A1 true EP2606520A1 (fr) 2013-06-26
EP2606520B1 EP2606520B1 (fr) 2016-04-20

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EP11748578.9A Not-in-force EP2606520B1 (fr) 2010-08-17 2011-08-11 Cellule électrochimique avec au moins un dispositif de décompression

Country Status (7)

Country Link
US (1) US20130216873A1 (fr)
EP (1) EP2606520B1 (fr)
JP (1) JP2013537694A (fr)
KR (1) KR20140004625A (fr)
CN (1) CN103140956A (fr)
DE (1) DE102010034545A1 (fr)
WO (1) WO2012022448A1 (fr)

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DE102012020011A1 (de) 2012-10-12 2014-04-17 Volkswagen Aktiengesellschaft Vorrichtung zum Entgasen einer elektrochemischen Zelle
DE102013012643A1 (de) * 2013-07-30 2015-02-05 Li-Tec Battery Gmbh Zellmodul mit elektrochemischer Energiespeicherzelle
DE102014013572A1 (de) 2014-09-13 2016-03-17 Li-Tec Battery Gmbh Elektrochemische Zelle mit Zellengehäuse und Batteriesystem mit entsprechenden elektrochemischen Zellen
DE102014019075A1 (de) * 2014-12-18 2016-06-23 Daimler Ag Zellblockvorrichtung für eine Kraftfahrzeugbatterie
KR102332446B1 (ko) * 2015-01-14 2021-11-29 삼성에스디아이 주식회사 이차 전지 및 그 팩
CN112133851A (zh) * 2019-06-25 2020-12-25 比亚迪股份有限公司 电池包以及具有该电池包的车辆
DE102019121510A1 (de) * 2019-08-09 2021-02-11 Bayerische Motoren Werke Aktiengesellschaft Dichtung für ein Batteriegehäuse einer Hochvoltbatterie, Verfahren, Batteriegehäuse, Hochvoltbatterie sowie Kraftfahrzeug
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Also Published As

Publication number Publication date
CN103140956A (zh) 2013-06-05
DE102010034545A1 (de) 2012-02-23
KR20140004625A (ko) 2014-01-13
JP2013537694A (ja) 2013-10-03
EP2606520B1 (fr) 2016-04-20
US20130216873A1 (en) 2013-08-22
WO2012022448A1 (fr) 2012-02-23

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